Shivmanmeet Singh, Narwant Singh Grewal, and Baljeet Kaur. “PERFORMANCE EVALUATION OF INTER-SATELLITE OPTICAL WIRELESS SYSTEM ON NON-GEOSTATIONARY ORBIT USING DIFFERENT QAM TECHNIQUES WITH DSP”. Journal Punjab Academy of Sciences, vol. 23, Dec. 2023, pp. 352-60, https://jpas.in/index.php/home/article/view/89.